In this study, gain-switching characteristics of InAs-InP(113)B quantum dot laser based on multi-mode rate equations are investigated for the first time by applying an external Gaussian pulse beam into the excited state to obtain short pulses. The rate equations including nonlinear gain are solved for direct relaxation model by 4th order Runga-Kutta method. The obtained results demonstrated that width of gain-switching output pulses are long due to dominant effect of ground state photons having long width without optical beam. Furthermore, pulse width increases with the increasing the peak injection current was observed. However, it was found that since excited state photons have narrow width compared to that of ground state, width of output pulses decreases giving a pulse width of around 25 ps owing to dominant effect of excited state with the applying optic beam into excited state. Our results also indicated that differential-gain of excited and groundstates decreases with the increasing of the homogeneous and inhomogeneous broadenings.
In this paper, the investigation of gain-switching characteristics of an InAs/InP Quantum dot laser is performed for direct and cascade relaxation models, theoretically. The model is based on single mode rate equations, which are solved by the Runge-Kutta method. Moreover, the effect of external optical beam irradiation to the excited state are investigated for both relaxation models. Our results showed that for the first time, under the optical Gaussian pulse beam it is possible to generate short pulses with a width of around 30 ps with a high peak power for the direct and cascade relaxation models. It was also found that in the absence of external optical beam irradiation, width and peak power of output pulses for cascade relaxation model are slightly smaller than that of direct relaxation model whereas in the presence of optical beam, they are approximately the same for both models. Obtained results have great importance for the fields where short optical pulse is an important demand such as long-distance optical transmission and medical biotechnology.
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